Scaffold-supporting mechanism.



E. H. HENDERSON.

SOAFFOLD SUPPORTING MECHANISM.

APPLICATION FILED SEPT. 23. 1910.

1,035,703. Patented Aug. 13,1912.

8 SHEETS SHEET] W 1 205 [Z fiends/5072 A torvzez s B. H. HENDERSON.

SCAFFOLD SUPPORTING MECHANISM.

APPLICATION FILED $EP'I.23,191\).

1,035,703. Patented Aug. 13,1912.

3 SHEBTS- SHEET 2.

MHZ 15229539; k

H wmw 11/. MW 1% 1176726505070 E. H. HENDERSON. SCAFFOLD SUPPORTING MECHANISM. APPLICATION FILED SEPT. 23 1910.

Patented Aug. 13, 1912.

3 SHEETS-$1113.31" 3.

I v UNITED STATES PATENT OFFICE.

ELIAS H. HENDERSON, CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS,

T HENDERSON SCAFFOLD HOIS'I COMPANY, OF CHICAGO, ILLINOIS, A CORPORA- 'IION OF ILLINOIS.

SCAFFOLD-SUPPORTING MECHANISM.

Specification of Letters Patent.

Application filed September 23, 1910. Serial No. 583,346.

Patented Aug. 13, 1912.

To all whom it may concern:

Be it known that I, ELIAS Hncmmn HENDERSON, a citizen ofthe United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and Improved Scaflold-Supportin I Mechanism, of which the following is a fill,

clear,'concise, and exact description, reference being had to the accompanying drawin s, forming a part of this specification.

Fl invention relates to an improved form of scaffold supporting mechanism adapted for use in connection with scafiolds provided with hoisting devices such as are used in the putlog' are preferably located at one of its ends and upon a common axle, as a result of which the other edge of the scaffold may be brought close to the side of the building 1 Without having any mechanism on the scaffold between the workman and the buildv the scaffold to the upper portion of the a invention also provides an improved form 'of outrigger construction for securing the upper end of the supporting, cables of framework of the building.

The several drawings illustrating my invention are as follows:

Figure 1 is a perspective view of a-scaffold in connection with a building upon which it is used. a Fig. 2 is an enlarged and view-of a scaffold and its Supporting outrigger showing in detail the hoisting mechanism. Fig. 3 is a plan view of the scaffold shown in Fig. 2, the platform of the scaffold being shown in dotted lines to more clearly indicate the construction of the supporting putlog. Fig. 4 is a view of one of the hoisting drums and its operating lever taken along the line 4-4 in Fig. 3. Fig. 5 is an .6 shows in plan view-a modified form of putlog construction for supporting the hoisting drums and retaining pawls' Fig.

7 shows, in a view similar to Fig. 2, a modified form of hoisting mechanism and also a preferred form of outrigger construction for supporting the scaffold. F ig. 8 is a plan 'view of the putlog shown in Fig. 7. Fig. 9

is a plan view of the outrigger shown in Fig. Figs. 10 and 11 are top andside views of a modified construction of putlog.

Similar numerals refer to similar parts throughout the several views.

As shown in Fig. 1, the scaffold "1 is supported by cables 2 and 3 from the Outriggers 4 secured to the upper portion 5 of the framework of the building upon which the scaffold is used; The scaffold 1 has extending transversely beneath it the putlogti which carry the drums 7 and 8 for receiving the cables 2 and 3 respectively.

As shown in Figs. 2 and 3, the drums 7 and 8 are mounted upon a commonaxle 9 which extends through the two members of the putlog 6. made by bending a bar of metal, as iron or steel, so that at the right hand. end, as

shown in Figs. 2 and 3, the members thus formed are at a suflicient distance from each other to receive between them the two hoisting drums 7 and 8, and at the other end of the putlog the members are brought close enough together so as to support between them sheave 10 upon an axle 11 extending through such members. The bar used in constructing the putlog is continuous throughout and is bent around the sheave 10 so that the cable 3 which passes beneath the floor of the scafiold 1 around such sheave and up to the outrigger 4., is inclosed by the bent end of the "putlog. 'As indicated in Fig. 3, the cable 3 iswound upon the drum 8, while the cable 2 is wound upon the drum 7. I Pawls 12 and 13, supported by a rod or The putlog 6 is preferably bolt 14 extending between the right hand ends of the members of the putlog, are prosuch recesses having formed. around their peripheries teeth to be engaged by the ends of the operating lever-s16 andt17. These lev rs. as indicated in Fig.6, are of thicker material at their lower ends than are the upper portions of such levers in order that.

the pointed lower ends may engage the internal ratch ets referred to. .Each lever is' formed that the motion of the levers in hoisting the scaffold is toward the scaffold rather than away from it in order to provide against accident in' case the lovers should slip during the hoisting operation. Each operating lever may be actuated independently of the other associated with "the same put-log to level that port-ion of the scaffold and. in order to secure the requisite leverage a pipe 19v may he slipped over the end of the lever to be actuated, thus permitting the use of comparatively short levers to permitthem to beless in the way of the workmen on the scaffold. When the scaffoldis leveled transversely at any particular putlog, the levers 16 and 17 may be secured together by means of a bolt 20 extending through them and the pipe 19 I .may then be 'placedover the ends of both 4 the drums 7 and 8.

preferred when it is suflicient to have but of the levers to actuate them together, as

a result of which the putlog as a whole will be raised by a single operation of the hoisting mechanism.

As will be seen from Fig. 3, the upwardly extending cables2and 3 are so related to the putlo-gand the hoisting mechanism that they cannot be displaced from the positions they occupy in such a manner as toTpermit the scaffold to drop and that, therefore, such an accident cannot occur unless the cables or someof the hoisting mechanism breaks.

In the modified construction shown in Fig. 6, the right hand ends of the members of the putlog- 6 are bent as indicated at 6, so that they come more nearly together than shown in Fig. 3. The bolt or rod 14: ex-

tends through the right hand ends of the putlog members to support the pawls 13 engaging the ratchets formed on the heads of This construction is one holding pawl for each hoisting drum.

In the putlog construction shown in Figs.

7 and 8, the side members of the'putlog 6 are Welded or secured together in suitable manner so as to constitute aco-ntinuous loop and the hoisting drums 7 and 8 are supported wlthin the right hand end of, the loop in the manner described above for the put- .log shown in Figs. 2and 3. In this modification, however, the holding pawls are mounted upon a rod or bolt extending through the members of the putlog at the left ofthe drums 7 and 8 instead of in the position indicated in Figs. 2 and 3. For this modified construction thepawls 22 supported on the rod or bolt 21 are provided with hooks at their engaging endsv to re tain the hoisting drums in any position to,

which they may be moved by means of the operating levers 16 and'17. In this manner the pawls are more readily accessible to the workmen on the scafiold than they are in the construction indicated in Figs. 2 and 3. A stop bar 23 is secured to the right hand end of the putlog shown in Figs. 7 and 8 and is so bent and located as to lie in the path of the operating levers l6 and I 17 to prevent their being moved around to. the right beyond the position indicated in Figs. 7 and 8. This construction furnishes.

a. safeguard to prevent rotation of thedrums 7 and S if, for any reason, the retaining pawls 22 fail to operate or break.

The outrigger shown in .Figs. 7 and 9 consists of a substantially horizontal compression member 24 adapted at its left hand end to engage and Test against a beam 25 of the upper portion of the framework of the buildirig upon which the scafi'old is to be used. The right'hand end of the memher is supported by a tension rod or rods 26. bent at the left hand end so as to hook over the top of the beam 25. Connection rod or rods 26 and the right hand end of the member 24 by means of a bolt 27 from which a clip 28 is supported'to receive'the is made bet-ween the right hand end of the upper end of -the cable 2.. The left hand end of the member 24 is secured in proper position upon the beam 25 by one or more hook clamps 29 engaging the lower part of the beam 25 and connected. to the left hand end oft-he member 24 by a bolt 30, which also supports a clip 31 engaged by the upper end of the cable-*3. A number of holes 32 and 33 are provided in the member 24; so that the bolts-27 and 30 may be differently disposed relatively to the member 24: to accommodate any size or kind, of beam 25 that may be employed in the upper porscafi'oldL As shown ,in Fig. 9, it is preferable to employ two tension rods 26 and to separate them at their points of engage- 'tion of the framework of thebuilding and (from which it is desirable to support the ment of thebeam 25 ,toprovide against-lateral motion of the outrigger.

in the modified construction shown in I Figs. lO-and 11.,xthe putlog 6, while formed of a continuous bar of metal, is extended over the top of the drums 7 and 8, as shown zit-6 instead of around the right hand sides of such drums as shown in Figs. 7 and 8.

The portion 6* thus disposed constitutes a stop for preventing motionof the operating and thus the retaining pawls 22 are located just inside of the side members of the putlog 6, as a result of which the strain exerted upon the bolt 21. is communicated to the members of the putlog with less bending moment upon the bolt 21.

The left hand end of the putlog 6 as shown in Fig. ill is bent downward and around the sheave 10 so as to provide for the use of a comparatively large sheave if desired. The left hand end of the putlog 6 surrounds the sheave 10 in this modification on its lower side and thus incloses the cable 3 as effectually as it does in the construction shown in Figs. 7 and S.

While I have shown my invention in the particular embodiments herein described, I do not, however, limit myself to these constructions, but desire to claim any mechanical equivalents that may suggest themselves to those skilled in the art.

\Vhat I claim is:

1. A scatl'old support comprising in combination a scaffold supporting member having two members of bar metal extendingin a horizontal plane and across the scaffold, a hoisting drum between the members at one end of the scaffold supporting member, an axle extending through the drum and such members at one end of the scatlold supporting member, pawl and ratchet mechanism associated with the drum, a sheave between such members at the other end of the scatfold supporting member, and an axle for the sheave extending through such members. such members forming a loop at the sheave end. to surround such sheave and to prevent disengagement ot the cable with the sheave.

2. A scatl'old support comprising in combination a scaffold supporting member having two members bent from a single bar of metal and disposed in a horizontal plane, cables for supporting said scatlold supporting member, a drum for each cable, a common axle for such drums extending through such members at one end of the scaffold supporting member, a sheave at the other end of the scatl'old supporting member between such members, and an axle for the sheave extending through such members, one of the drums adapted to directly receive one of the cables while the other cable is conducted around the sheave to the other drum, pawl and ratchet mechanism associated with each drum, said drums and pawl and ratchet mechanisms having their hearing ends supported in the same horizontal plane, such bar being bent around the sheave to inclose the corresponding cable thereby preventing disengagement of the cable with the sheave.

3. A scatlold support comprising in combination a s'catl'old supporting member having two members bent from a single bar of metal and disposed in a horizontal plane, cables for supporting said scaffold supporting member, a drmn for each cable, a common axle for said drums extending through such members at one end of the scaffold suporting member, a sheave at the other end of the scaffold supporting member between such members, an axle for the sheave extending through such members, one of the drums adapted to directly receive one of the cables while the other cable is conducted around the sheave to the other drum, pawl and ratchet mechanism associated with each drum, said drums, pawl and ratchet mechanismsand sheave being supported in one horizontal plane, such bar being bent around the sheave to inclose the corresponding cable and thereby prevent its disengagement with the sheave.

4. A scatlold support comprising in combination a scaffold supporting member having two memliers bent from a sing e bar of metal and disposed in a horizontal plane, cables "for supporting said scaffold supporting member a drum for each cable, a common axle for said drums extending through such members at one end of the scatlold supporting member, a sheave at the other end of the scatl'old supporting member between such members, onecf the drums adapted to directly receive one of the cables while the other cable is conducted around the sheave to the other drum, pawl and ratch et mechanism for each drum, such bar being bent around the sheave to inclose the corresponding cable to prevent its disengagement with the sheave. '1 v t l i e I I l 5. A scatt'old shpport comprising in combination a hoistii g druin, {continuous scaffold supporting.member disposed in a horizontal plane and conformed at one end to support the drum, a sheave carried by the other end of the member, and pawl and ratchet mechanism associated with the drum, said drum, pawl and ratchet mechanism and sheave being supported in the same horizontal plane.

In witness \vhereot,I hereunto subscribe my name this 17th day of September, A. D.-

ALBERT ,BELL, Roman I". Baaonn. 

